The Philippines has confirmed a second case of the deadly Middle East Respiratory Syndrome (Mers) virus in a man who showed symptoms after arriving in Manila last month from Dubai.

The 36-year-old was admitted to hospital on Saturday and was under observation, Health Ministry spokesman Lyndon Lee-suy said, adding contact tracing was now under way to prevent the spread of the disease.

The man had also travelled to Saudi Arabia, the spokesman said. His condition was improving and there was no known transmission so far.

The first case discovered in the Philippines was in January, a Filipino nurse working in Saudi Arabia who survived.

Mers was first identified in humans in Saudi Arabia in 2012 and the majority of cases have been in the Middle East. Scientists are not sure of the origin of the virus, but several studies have linked it to camels.

Isolated cases cropped up in Asia before an outbreak erupted in South Korea in May and became the largest outside of Saudi Arabia.

A total of 186 people have been infected in South Korea, and 33 have died.